Not Supported File Format??

OK yesterday i watched a lot of my favourite tv shows via Serviio and they worked fine. No problem at all

Today i click them and the 'Not Supported File Format' box pops up. It makes no sense

I have tried loads of them and they all seem to be this way. These are MKV files

I have also tried other shows (not mkv) and they seem to work fine so it''a not all of them

[Illico]

What is your device ?
What is the profile selected on serviio console ?

[Iveky]

maybe your client changed IP address, what means default profile, check it, as said Illico.

For some strange reason it started working again after a few hours

I have no idea what the problem was...